Vitruvius
,
L. Victrvvii Pollionis ad Cesarem Avgvstvm De architectvra
,
1490
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quot menſibus magiſtratus in eum locum proficiſcitur & </
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ficium facit & </
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</
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<
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"># De porrecto & </
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# Etractoriis rationibus que neceſſaria putaui breuiter ex
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# d #poſui: </
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<
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">uirtutes due res diuerſe & </
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# ſe diſſimiles uti congruentes ita principia pariont eos p
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fectus unam porrecti quam græci Euthiam uocitant alteram rotú
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ditatis quam Cycloten appellant. </
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<
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">Sed uero ne ſine rotunditate
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motus porrecti nec ſine porrecto rationis uerſationes onerum poſ
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ſunt facere leuationes. </
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<
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">id autem ut intelligatur exponam. </
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<
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uti centra axiculi in orbiculos & </
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">in trocleis collocantur per quos
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orbiculos funis circumactus directis ductionibus & </
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">i ſucula col
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locatus uectium uerſationibus onerum facit egreſſus in altum. </
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<
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">cui
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us ſucule cardines uti centra porrecti in celoniis foraminibuſ ei
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us uectes concluſi capitibus ad circinum circumactis torni ratióe
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uerſando faciunt oneris elationem. </
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<
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">quemadmodum etiam ferreus
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uectis cum eſt admotus ad onus quod manuum multitudo non
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poteſt mouere ſuppoſita uti centro cito porrecta preſſione quod
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græci hipomodió appcllant & </
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<
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">lingua ſub onus ſubdita caput ei
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us unius hominis uiribus preſſum id onus extollit. </
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">id autem qđ
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breuior pars prior uectis ab ea preſſione quod eſt centrum ſubic
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ſub onus: </
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<
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">& </
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">quod longius ab eo centro diſtans caput eius per id
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deducitur faciundo motus circinationis cogit preſſionibus exami
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nare paucis manibus oneris maximi pondus. </
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ctis ferreus lingula ſubiecta fuerit. </
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">ne eius caput e ṕſſióe in imú
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ſed aduerſus in altitudinem extollet́ lingula fulcta in ereo ſolo ha
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bebit eam pro onere. </
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">oneris autem ipſius angulum pro preſſione
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ita non tam faciliter quam pro oppreſſione ſed aduerſus nihilo/
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minus in pondus oneris erit exercitatum. </
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">Igitur ſi plus lingula
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uectis ſupra hippomodion poſita ſub onus ſubierit & </
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propius centrum preſſiones habuerit non poterit onus eleuare ni
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ſi quemadmodum ſupra ſcriptum eſt. </
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<
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dinis per caput ne ductionibus ſuerit ſacta. </
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